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HD6433644R Datasheet(PDF) 182 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 182 Page - Renesas Technology Corp

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Section 6 ROM
Rev. 6.00 Sep 12, 2006 page 162 of 526
REJ09B0326-0600
tOSC1
3.0 to 5.5 V
12
±0.6 V
12
±0.6 V
VCC + 2 V to 11.4 V
VCCV
VCCV
φ
VCC
VPP
(boot mode)
Period during which flash memory access
is prohibited and VPP flag set/clear period
VPP
(user program
mode)
RES
0
µs min.
0
µs min.
Timing of boot
program branch
to RAM space
Min. 10
φ cycles
(When
RES is low)
0
µs min.
0 to VCCV
0 to VCCV
Figure 6.23 VPP Power-On and Cut-Off Timing
6. Do not apply 12 V to the FVPP pin during normal operation.
To prevent erroneous programming or erasing due to program runaway, etc., apply 12 V to the
FVPP pin only when programming or erasing flash memory. If overprogramming or
overerasing occurs due to program runaway, etc., the memory cells may not operate normally.
A system configuration in which a high level is constantly applied to the FVPP pin should be
avoided. Also, while a high level is applied to the FVPP pin, the watchdog timer should be
activated to prevent overprogramming or overerasing due to program runaway, etc.



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